[#151069492] Bug fix: Cases do not appear in graph after "Delete Cases" undo
[#151069492] Bug fix: Cases do not appear in graph after "Delete Cases" undo

Was due to a miscalculation of the indices of the cases being added

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap